5 benefits of using strobed lighting for machine vision applications

Gardasoft controller for machine vision

Gardasoft controllerPulsing (aka strobing)  a machine vision LED  light is powerful technique that can beneficial to machine vision systems in various ways.

 

This blog post outlines 5 benefits you will receive from pulsing  a LED  light head.  Gardasoft is an industry leader in strobe controllers capable of driving 3rd party LED light heads or custom LED banks for machine vision.

1 – Increase the LED light output

It is common to use pulsed light to “freeze” motion for high speed inspection.  But, when the light is on only a short term in burst, its possible to increase the light output beyond the LED manufacturers specified maximum, using a technique called “Overdrive”.   In many cases, the LED can be powered by 10X over the constant current power input in turn providing brighter pulses of light.  When synchronized with the camera acquisition, a brighter scene is generated.Gardasoft LED overdrive

2 – Extend the life of the LED 

As mentioned in the first benefit, strobing a LED light head only turns on the LED for short period of time.  In many cases, the duty cycles are very low which extends the life of the LED and any degradation in turn, keeping the scene at a consistent brightness for years.  (i.e. If the duty cycle is only 10%, the lifetime of the LED head will increase by 10%)

3 – Ambient Light control

Ambient light conditions frequently interfere with machine vision measurements and these issues can be solved by pulsing and over driving the system’s LEDs. For example, over driving the LED by 200% doubles the light intensity and enables the camera exposure to be halved, so reducing the effects of ambient light by a factor of 4.  The end result is the cameras exposure is only utilizing light from the give LED source and NOT ambient light.

4 – High speed imaging and Increased depth of field

Motion blur in images from fast-moving objects can be eliminated with appropriate pulsing of the light.  In some cases a defined camera exposure will be good enough to freeze motion (read our blog on calculating camera exposure), but may suffer in light intensity with constant illumination.  “Over driving” a light can boost the output up to 10x its brightness rating in short pulses.  Increased brightness could allow the whole system to be run faster because of the reduced exposure times.  Higher light output may also allow the aperture to be reduced to give better depth of field.

Extended Depth of Field (DOF) is achieved with a brighter light allowing the f-stop to be turned down

Gardasoft controllers include our patented SafePower and SafeSense technology which prevents over driving from damaging the light.

5 -Multi-Lighting schemed & Computational Imaging

Lighting controllers can be used to reduce the number of camera stations. Several lights are set up at a single camera station and pulsed at different intensities and duration’s in a predefined sequence.

CCS America Shape from shading
Generate edge and texture images using shape from shading

Each different lighting can highlight particular features in the image. Multiple measurements can be made at a single camera station instead of needing multiple stations and reduces, mechanical complexity saving money. For example, sequentially triggering 3 different types of lighting could allow a single camera to acquire specific images for bar code reading, surface defect inspection and a dimensional check in rapid succession.

Pulsing can also be used for computational imaging, where a component is illuminated sequentially by 4 different lights from different directions. The resultant images would be combined to exclude the effect of random reflections from the component surface.  Contact us and ask for the white paper on Computational imaging to learn more

CCS Computational imaing
The images on the right (top and bottom) were taken with bright field and dark field lighting. The left images is the the result of the computational imaging combining the lighting techniques allowing particles and water bubble to be seen

Pulsed multiple lighting schemes can also benefit line scan imaging by using different illumination sources to capture alternate lines. Individual images for each illumination source are then easily extracted using image processing software.

In conclusion, strobe controllers can provide many benefits and save money in an overall setup more than the cost of a controller!

1st Vision has additional white papers on the following.  Contact us an ask for any one of these informative white papers – Simply send an email and ask for 1 or all of the white papers.
1- Practical use of LED controllers
2 – Intelligent Lighting for Machine Vision Systems
3- LED Strobe lighting for ITS systems
4 – Liquid Lens technology and controllers for machine vision.
5 – Learn about computational imaging and how CCS Lighting can help

Contact us

1st Vision’s sales engineers have over 100 years of combined experience to assist in your camera selection.  With a large portfolio of lenses, cables, NIC card and industrial computers, we can provide a full vision solution!

 

Related Topics

Learn how liquid lenses keep continuous focus on machine vision cameras when the working distance changes.

White Paper – Key benefits in using LED lighting controllers for machine vision applications

Advanced Illumination Eurobright Product line prices now reduced 20-50% – Learn more about these IP67 lights with built in controllers!

 

Advanced Illumination has reduced pricing on their EuroBright lighting product line. This IP67 lighting line provides the highest levels of strobed or continuous operation using “FlexTech” technology and does not require additional controllers.

FlexTech™ is Advanced Illumination’s exclusive technology collection which they have spent years perfecting. This consists of self-sustaining technologies for your system protection and your peace of mind.
The EuroBright Series consists of 6 styles of illuminator’s providing various lighting geometries from area illumination to back lighting. Each light style can be ordered in various wavelengths and has self contained electronics allowing continuous or strobe operation.

EuroBright Illuminators are feature rich with the following key features:

  • Low cost, feature-rich design
  • Robust IP67 enclosures
  • On-board smart driver – seamlessly provides strobe or continuous operation
  • Adaptive Overdrive – Optimized power under all strobe conditions
  • Adaptive Power – Optimal heat damage protection
  • Daisy-chain options in select models
  • Red, White and Blue wavelengths available.

What are the benefits of FlexTech technology?

In essence, FlexTech technology maximizes intensity even in varied temperature conditions ensuring the illuminator is providing maximum performance and protected.

You do not have to worry about over driving the light source.. FlexTech does this for you!

What benefits does FlexTechnology bring to EuroBright Illuminators?

Adaptive Overdrive

Adaptive Overdrive™ shapes the output pulse of the illuminator to maximize the intensity seen in the image. This technology allows for a very flexible on-board driver where the output is always performing at its peak with any camera exposures.



Adaptive Power

Adaptive Power allows for the user to “train” the light to operate in varied external temperatures. This was designed primarily for the EuroBriteSeries of lights. Training allows the controller to identify the correct operational current such that the light does not overheat. Adaptive Power guarantees maximum brightness and lifetime regardless of the installation.
Smart Power Allocation
Smart Power Allocation performs load-balancing to be sure each individual channel on a controller is always being utilized to its fullest. Rather than relying on a fixed “current” for a light, factors such as voltage and string combination are considered in determining the correct operating range. Standard products have up to a 30% higher output with this feature enabled.
Packed with features, EuroBright illuminators are one of the most advanced lights on the market for a great price!


Need help to ID the correct lighting for your application? We have a lighting expert on staff to discuss how to solve your application!

1st Vision has extensive knowledge in industrial imaging and can help answer any questions. We have over 100 years of combined knowledge and look forward to discussing your application.

Please do not hesitate to Contact us! 1st Vision can provide a complete solution including cameras, lenses, lighting and cables.

Ph: 978-474-0044
info@1stvision.com
www.1stvision.com

Follow us on Social Media!

 https://www.facebook.com/pages/1st-Vision/944658058935262?fref=ts

White Paper – Key benefits in using LED lighting controllers for machine vision applications

 

A successful, cost-effective application of a Machine Vision system is often dependent on the interplay of many individual elements, including machine vision lighting.  As much as an Light Emitting Diode (LED) appears to be a basic electronic component, driving it in a fashion suitable for machine vision applications is non-trivial.

LED’s have become the staple in industrial imaging applications in which consistent illumination is key.  In order to achieve constant illumination and synchronization with cameras, controllers from Gardasoft should be utilized.  

Download the full white paper 
here NOW 

  



Why use a LED Lighting Controller?

LED Light Controllers are an essential element of any vision system which needs to optimize illumination intensity and precision trigger sequencing between vision cameras and lights. The following are the main areas where you will benefit from the use of an LED light controller:

Pulse (or strobe) control
Where you need to synchronize the ON time of your light with the camera and target product (controllers are available for nano-second timing resolution)

Overdriving
Where you require increased intensity from your LED light for a short, defined, period of time (with up to 10x over driving capability)

Continuous current power supply (constant light)
Where you require a highly stable constant current supply for constant on LED lighting

Control of multi-lighting schemes
For systems with multiple lighting configurations which require intensity control and high speed synchronization (from single or multiple triggers)

Remote configuration changes
For systems where it is advantageous to have remote setting of lighting system parameters – eg: to facilitate efficient set-up during system commissioning


LED Technology Overview

LEDs are current driven devices.  While LED Lights are specified as either 12V or 24V lights, the actual LEDs are semiconductor devices whose light output is a direct result of the current through the device, not the voltage. 

All LED device manufacturers specify that current control is advised for efficient use.  Typically, LED datasheets will indicate that very small changes in LED voltage results in large changes in the LED current; and large changes in LED current results in large changes in light output intensity. 

As seen in the diagram to the right, small changes in forward voltage (Vf),greatly change current ( If )

Gardasoft LED controllers regulate the current, not the voltage, so that light output is stable, tightly controlled and highly repeatable. 

Controlling the current allows for precise control of the LED light output, with an additional   benefit to users looking to overdrive their lights to increase light output.


There are many advantages of accurate pulsing and over driving LED’s.  However it is also extremely important to ensure LEDs are over driven safely to ensure long life and not catastrophic failure.   

In this white paper, the following topics are covered:

  • An overview of LED technology
  • How to pulse and overdrive LEDs safely using Gardasoft’s patented “SafeSense” technology
  • Three trigger modes from constant, pulses and switched for various applications.
  • How “SafeSense” technology determines the optimum current for consistent LED drive. 
  • Advanced and custom controller functions.  Example – allowing multiple pulses at different intensity levels over various LED channels.  




1st Vision has over 100 years of combined experience in industrial imaging and has a resident lighting expert on hand. 


Contact us for pricing on all Gardasoft controllers and suggestions on your vision and lighting application.  


Ph:  978-474-0044
info@1stvision.com
www.1stvision.com  

Follow us on Social Media!

     https://www.facebook.com/pages/1st-Vision/944658058935262?fref=ts             

Advanced Illumination Eurobright Illuminators combine lights and an intelligent controller.. All for the price of a light!

document.write(" "helvetica" , sans-serif;">Advanced Illumination has released their new EuroBright lighting product line.  The new lighting line provides the highest levels of strobed or continuous operation using "FlexTech" technology and does not require additional controllers.  

FlexTech™ is Advanced Illumination’s exclusive technology collection which they have spent years perfecting. This consists of self-sustaining technologies for your system protection and your peace of mind.

The EuroBright Series consists of 6 styles of illuminator's providing various lighting geometries from area illumination to back lighting.  Each light style can be ordered in various wavelengths and has self contained electronics allowing continuous or strobe operation.  

EuroBright Illuminators are feature rich with the following key features:

  • Low cost, feature-rich design
  • Robust IP67 enclosures
  • On-board smart driver - seamlessly provides strobe or continuous operation
  • Adaptive Overdrive - Optimized power under all strobe conditions
  • Adaptive Power - Optimal heat damage protection
  • Daisy-chain options in select models
  • Red, White and Blue wavelengths available.  

What are the benefits of FlexTech technology?  

In essence, FlexTech technology maximizes intensity even in varied temperature conditions ensuring the illuminator is providing maximum performance and protected.  

You do not have to worry about over driving the light source.. FlexTech does this for you!

What benefits does FlexTechnology bring to EuroBright Illuminators? 

Adaptive Overdrive

Adaptive Overdrive™ shapes the output pulse of the illuminator to maximize the intensity seen in the image. This technology allows for a very flexible on-board driver where the output is always performing at its peak with any camera exposures.



Adaptive Power

Adaptive Power allows for the user to “train” the light to operate in varied external temperatures. This was designed primarily for the EuroBriteSeries of lights. Training allows the controller to identify the correct operational current such that the light does not overheat. Adaptive Power guarantees maximum brightness and lifetime regardless of the installation.

Smart Power Allocation
Smart Power Allocation performs load-balancing to be sure each individual channel on a controller is always being utilized to its fullest. Rather than relying on a fixed “current” for a light, factors such as voltage and string combination are considered in determining the correct operating range. Standard products have up to a 30% higher output with this feature enabled.

Packed with features, EuroBright illuminators are one of the most advanced lights on the market for a great price!  Email us with your contact details for a quote.


Need help to ID the correct lighting for your application?  We have a lighting expert on staff to discuss how to solve your application!  

1st Vision has extensive knowledge in industrial imaging and can help answer any questions.  We have over 100 years of combined knowledge and look forward to discussing your application.  

Please do not hesitate to Contact us!  1st Vision can provide a complete solution including cameras, lenses, lighting and cables.  

Ph:  978-474-0044
info@1stvision.com
www.1stvision.com  

Follow us on Social Media!

     https://www.facebook.com/pages/1st-Vision/944658058935262?fref=ts